Saw gumming and sharpening machine



Aug. 5, 1952 H. v. HOLMES SAW GUMMING AND .SHARPENING museums 2 SHEETS-SHEET 1 Filed Jan. 4, 1951 5, 1952 H. v. HOLMES 2,605,654 SAW GUMMING AND SHARPENING MACHINE J Filed Jan. 4, 1951 2 SHEETS-SHEET 2 s flli HARP/5 L HOLMEJ done-in one operation,

(as opposed to the gullet) is accomplished in for only the most skilled been used generally,

i atented Aug. 5, 1952 saw,v GUMMZNG AND snanrsmnd I v Harris V Holmes, Marathon, N. Y.

Application January 4, 1951, Serial No. 204334;?

The invention relates ming and sharpening circular saws. j

Gumming and sharpeninga circular sawfhasflbeenheretofore adimcult task, wherein gumming, that'isgrinding out the gullet ofthe teeth, is then sharpening the front anothe'r'operation. Then, too; the bevels on the front' and back ofthe' teeth, and the set of the teeth make gumming and sharpening ajob artisan, and ithas usually been done manually. Some automatic devices have been employed, but these have not as their range of adjustment, accuracy and ease of operation'have not measured up to the requirements of the work, andfurthermore, the cost of their manufacture haslprecludedtheir general use.

I'have, after long experimentation, devised a machine, for use with an emery or other suitable abrasivewheel, which will gum and sharpen circular saws, affording the maximum" range of ad-' justment, can be operated with ease and certainty'of control, and can be. manufactured at comparatively low cost.

Itis an object of the invention to provide a machine which will enable anyone familiar with handling tools to gum and sharpen circular saws to 'a znicety, a task which heretofore has been to skilled artisans only.

provide a machine which,

entrusted It is another object to i in conjunction with an emery wheel will do a speedy,accurate gumming and sharpening job on circular saws, presenting the teeth for sharpening in a predetermined sequential manner.

A 'still further object comprehends the provision of a machine for employment in gumming and'sharpening saws which affords the maximum in adjustment, both for accommodating saws of different dimensions and to gum and sharpen varied, sizes and types of teeth.

A further object is to provide a machine which can be expeditiously operated and which may be manufactured at a minimum of cost, to place it within the pocketbook'and means of the small sho'p',.[the carpenter and the home craftsman.

Other objects will be apparent after a description ofthe invention unfolds. V i

Briefly described, the machine for summing and sharpening saws includes an adjustable, supporting frame for the saw blade wherein the blade is adapted to be mounted for rotation on the frame and move in a predetermined path or paths'with relation to an abrasive or grinding wheel, and means are provided for maximum adto a machine for gumjustment-of the saw for gummingandfsharpen ing, including means to tilt the saw-to'obtain beveling of the teeth.

In the drawings:-

Fig.1 is a top plan view of a preferred form" of the gumming and sharpening machine embodying my invention.

Fig. 2 is a sub-assembly of the tilt and lateral assembly device. r

Fig. 3 is a side viewwith saw mountingand outset:

I, bracket 38, socket cap screw 2, hex nut v 39, fiat spring 3, hex head cap screw 40, fine adjustmenti, extension spring collar 5, finger I a 4i, hub- 6, finger arm 42, handle 7,

i, finger arm support 43,'handle grip 8, standard 44, pivot 9, handle i 45, hub

in, pivot pin 46, shaft vl l, pivot pin support 41, stop block I l2, rivet l8, flat head machine [3, socket cap screw screw l4, bracket 49, feather'key l5, head 50, indexpin I6, socket set screw we 5!, indexplate l1, finger screw 52, index handle I8, flat washer '53, compression spring 19, plate 54, index pin retainer I 29, cone A 55, knob 2!, cone B 56, special washer 22, spindle 51, fiat head machine 23, hex nut screw 24, cup 58, knob 25, arm 59, socket set screw 26, taper pin' 60, thrust block 21, shaft Bl, collar 28, extensionspring 62, clamp screw 29,'dowel 53, stub shaftv 30, screw eye 64, adjustment screw 3|, collar 65, housing 32, socket cap screw 66, shaft 33, bushing I 61, dowel f 15 34, shaft housing 68, socket cap screw 35, gland nut 69, hex headcap' screw" 36, extension i0. hex nut i 31, pin

separately are summarized below, at the The machine is supported on standard 8, which is received in index plate 5| and connected thereto by taper pin 26, as best shown in Fig. 2. As depicted in Figs. 1 and 2, the sub-assembly which provides for lateral and tilting adjustment 5 of the machine comprises the aforesaid index plate 5| which includes recesses for receiving index pin 50 having compression spring 53 attached to index pinretainer 54 and knob 55, all' assembledin index handle 52. This latter memher is pivoted on stub shaft 63 and fixedly secured to housing 65 which is also pivoted on said stub shaft. The stub shaft extendsthrough index plate 5|, has one end enlarged, and is held in assembled relationship by washer 56 and flat 5 head machine screw 57.

Housing 65 is bored therethrough and-'slidably received in the bore is shaft 66, one end of which carries thrust block 60. Through main upper exetension 0f housing 65 is threaded adjustment 2O Screw which x nd i ar ll l smi d h haft-1. 66, has knob 58 pinned at .theend adjacent to. thrust block 66 and can'be locked;againstdis-;;- placement by collar 6| and socket-.set--screw; 5.9; Thrust block 60 is pinned to and integral with shaft 66 andis-entirely separate from collar 6-1, the latter being held to shaft6 4-by-setscrew 59a, Clamp-screw 62 threaded into housing 65 is-pro vided to hold shaft 66 in desired position within I said housing. Loosening the setyscrew 59 and manipulation of knob 58 permits of lateralad- J'ustment of shaft 66,,theopp9site end of which is anchored in shaft housing 34 by taper pin;26- (3) see Fig. 3.

Tilting adjustment is effected by loosening clamp screw 62 by movement of handleSLmanipulating-handle 52 to the desired point-andeset-c ting index pin in the appropriate recess.

Shaft 21 extends through the shaft housing, at

one endof which is-mounted a handle 42 having hub 4| attachedtothe shaft as by dowel '29 -(2) Forwardly of the handle and also disposed on the shaft on the opposite-sides of shaft housing-34 are collars 3 I, each having socket cap screws 32,- which can be adjusted so; as to act as stops for-the forward and rearward-movement of shaft-2T;-

Positioned forwardly of the rearmostof collars 3|, and on shaft housing-34 is fine adjustment collar 40, adapted to-be held in desired-position by'flat spring '39 which is attached to the-housin as by pin 31 andcapscrew 38.

Head 15 is rigidly affixed to shaft 21by; taper pin 26 (2) and---receives vertically disposed spindle 22, having-s-ooketset screw l6 at its lowen end and at its upper-portion is mounted-pup 24" which hold apair of cones-2B, '2 I, the onebeneatha V andabovethe-saw bladeholding it firmly therebetween when hex nut -;23 is tightened.

Arm 25 is pivoted-eccentrically on spindle22* beneath cup 24 and extends laterally oppositely and outwardly from head l5, and has oneputer; extension slotted toreceive the forward 'en-dgof-ig shaft 46. The opposite end of the arm 25=has=, pivoted-thereon; slotted plate IS, the slot pro-- vided f-or adjustmentto compensate forsaws with:, varying diameters; The; lower portion ofgffsetfinger arm-support; 1'is adjustably supported in v the slot of plateqlil and adapted to be lockedirrv any desired positionb'y finger screw l'lgwithgfiat; washer l8 bBtWQGI'ITISaldSCI'GW and the bottom of ,7 the plate. v y

Pivot pin support ll is::riveted as. by-'rivet ,.l2. to finger -arm :support; I, to allow more contact surface for-finger arm6 and keep it from, sagging; This latter member pivots on pivot pin IUear-'-75 wheel.

- movement past the abrasivewheel.

4 ried by support 1 and at its outer end is mounted finger 5, as best shown in Fig. 5.

Hook shaped bracket [4 is fastened to head 15 and carries'hex nut 10 and adjusting screw 69 which acts as a stop for the forward movement of arm 25, while extension spring 26 attached to screw eye 36 and to the arm holds the arm against bracket I4.

Extending-laterally from shaft housing 34 is extension-36- attached to the 'housing as by-gland nut 35. This extension is transversely slotted and, the slots are adapted to receive stop block 41.

The forward end of shaft46 has hub 45 which pivots on pivot 44 which is supported and pivots on arm 25, member 44 serving both as a nut and apivot pin, withfinger screw l1 and flat washer I8 provided.

Adjustment from one notch to another on extension-1.36 'is accomplished by shoving stop block 47 to wide opening and shifting to the desired notch.

Bracket I, not hereinbefore-referredto,-is riva. eted to finger armsupport 'Landcarrieshexnut. cap screw 3 ,and-. .hex-nut 2. As statedtbefore .finger arm 6 can beadjusted intheslot of plate.

l9 to accommodatesawswith. diameters of from 6" to 10%. After adjustment to fitthe saw,,mem+.. her 31s adjusted to bring the front of thetootheto be gummed in line withtheside of. the abrasive,

Then the-screw 69 in bracket. l.4..is. ade J'usted so that finger :5 is about.r s roiian.incl' from v the bottom of the gullet...

With the left hand holdingthesaw blade position, grasp the handle 42..with. the right hand, and, move forwardly untilthe tooth is ground to... the desired; depth; Then. bring collar} I up. to the, confronting end .of shaft-housing, 34 and. fasten, thus assuring, that..with.each,stroke,;of shaft 21 forwardly,- the.depths.ofthefgulletswillbe uniform Next, adjust. thescrew of block, 41 on. shaft .46 to bringsaidshaft to theposition shown in Fig.1;

Following adjustmentof block 4'l, shaft 2.! manually, movedrearwardly until thesaw is .c1ear-. of the abrasive wheel. With shoulder-4710f. b1ock41 impinging.againsttshaft 36, shaft .46 ,will not-travel back-sin parallelism with shaft 21 ,caus ingarm, 25 ,to pivotwatpivotl22, thus revolving. thesawclockwiseby finger. 5., guiding thegback of the tooth to the proper-ourve-rb controlled...

The length of saw teeth produced .is-ggverned by the position, of pivot 44in. the slot of. arm,2 5,..

which is, adjustable inwardly and outwardly. of

5 pivot 22. The closerpivot44 is. to pivot 22 the-.

shorter the teeth,, The

moredistance between pivot. 44 and, pivot 22, the .longer, the saw -teeth. Next, .with the left hand disengage shou1der 47 "of stop block; 41 from extension 36 and spring 28 will return arm 2 5"and the cooperating,assem bly to proper position .for'grinding, the ,next tooth-L,

revolve thesaw blade manuall'y .counter clock A wise until t n m hie naased. byfi ee 5i and repeat operationpf movementof shaft 2'! inwardand outward of the emery wheel.

In-order-to'grindabevel to the front'andfbacki of teeth; handle 52 should be raised or lowered until index pin 56 engages-the selected recessof' index plate 5|. Sincehandle 52,"as' hereinbefore explained, extends oppositely toand is joined integrally withhousing 65 which encases shaft" 66, shaft 'fifif carrying ,shaft-housing 34' is'causedi to tiltzwith. shaft 63 as the pivotalipp nt, With; the adjustments for guiding the. proper. bevel-.1 achievedthrough positioning of the -handle 52,,4

proper bevel to'the other the saw may be manipulated by grasping handle 52 moving toward the emery wheel, grinding ternate teeth according to their set. alternate moved to the selected position for achieving the set of the unground teeth, which may then be ground.

As will be apparent to those skilled in the art, when positioning the gumming and sharpening machine relative to the emery, wheel, and as illustrated in Fig. l-it should be lined up with a line along the center of bearing 63 parallelling the inside of the point of the tooth to be ground and then along the face of the emery wheel to the center thereof.

I reserve the right to make such changes or modification as may come within the scope of the appended claims.

I claim:

1. A circular saw holding and positioning machine for use with a rotating abrasive wheel, in combination, a standard having a longitudinal extension, a housing having an upper and oppositely extending lower lateral extension pivoted on said longitudinal extension, a saw carrying bar, means to carry a saw on said bar, said bar slidably held by the housing and extending in front and rearwardly of the housing, means to limit the forward and rearward movement of said bar, a hook-shaped arm carrying After Z teeth are ground handle 52 should be Cir a finger mounted for lateral movement near one v outer end of'the bar and supported on an arm pivoted to one end of the bar, said finger adapted to engage the saw lelism with the saw carrying end by said arm pivoted to one end of the saw carrying bar, means provided on the shaft and on the arm pivoted to one end of the bar to pivot said arm upon sliding movement of said saw carrying bar to index successive saw tooth gullets.

2. A circular saw holding and positioning machine as described in claim 1 wherein a quadteeth gullets, a shaft in paralbar and supported adjacent one end by the housing and at its other rant is affixed to the standard, and means are provided on the upper extension of the housing for adjusting the tilt of the housing whereby teeth of the saw may be bevel sharpened according to predetermined adjustment of said means.

3. A circular saw holding and positioning machine as described in claim 1 wherein a uadrant carrying notches and calibrations is affixed to the standard and a lever carrying a detent is mounted on a part of the housing oppositely disposed to the saw carrying bar to adjustably tilt the bar to achieve a predetermined bevel sharpening of the teeth of the saw.

i. A circular saw holding and positioning machine as described in claim 1 wherein an arbor is mounted at one end of the saw carrying bar for holding the saw, and the arm supporting the hook shaped finger carrying arm is pivoted on the same arbor. I

5. A circular saw holding and positioning machine as described in claim 1 wherein the saw is mounted on the same center as the arm which supports the hook shaped arm carrying the finger which engages the saw tooth gullets, so that saw tooth gullets may be gummed and saw teeth sharpened sequentially.

, HARRIS V.IIOL1VIES.

appearances orren The following references are of record in the file of this patent:

UNITED STATES PATENTS 

